maxnorth

No, not a three way. Typical knob and tube wiring style: Line goes through the fixture and down to the switch, where the second wire is neutral.

I've got a 100-year old house with mostly 2 wires in the j boxes. Many of my 2474 2-wire switches perform fine, mainly where I don't have extensive dimming needs. But I've got two locations that don't work. When I dim these to around 60% or less, they will eventually turn off and then back on to that level, in sort of a slow, irregular flicker. My assumption is that the switch is failing to get enough power at these levels, or something. It's not a huge deal, as my Lutron switches work fine in these locations and I can simply revert to that. One location has 6 25-watt "candlestick" type incandescent bulbs in a chandelier. The other has 4 60-watt BR30 incandescents in cans. The locations have normal voltage levels. I'm not getting any communication errors. The switches seem to steal enough power when the circuits are off. Is this expected behavior with these 2-wires?

Yes, indeed, it was. So now, my question is not only answered, but I've learned how to use the ISY to control those options. Wonderful! Tested and fixed. Thanks so much.

A quick question. I've set my Insteon motion sensor for On-Only using jumper 4 and have reset it several times, including a factory reset. Still, when I add it to a scene with a Switchlinc, it will turn off the light after the countdown timer expires. Is there something about using a sensor in a Scene that does not allow me to use the On-only option? or is the sensor perhaps defective? My remedy at the moment is to avoid a Scene and instead use a program to turn the light on and off (via Wait statement). Works fine. Thanks in advance...